I have a 2008 Mercury Grand Marquis and the gas guage takes hours or days to show the gas tank full after I fill it up with gas, why?

Asked by Apr 08, 2015 at 10:01 AM about the 2008 Ford Crown Victoria Base

Question type: Maintenance & Repair

2008 Mercury Grand Marquis- the gas guage doesn't show the car full of gas after I fill it up with gas. After I drive off, it takes anywhere from an hour to days before the gas guage moves up to showing the tank full of gas. Why?

1 Answer

145

You probably have a defective 'Fuel Sending Unit' which is located inside the gas tank.

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